WO2019071282A1 - Dispositif de mélange et procédé de fabrication d'un béton à adjuvant fibreux - Google Patents

Dispositif de mélange et procédé de fabrication d'un béton à adjuvant fibreux Download PDF

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Publication number
WO2019071282A1
WO2019071282A1 PCT/AT2018/060231 AT2018060231W WO2019071282A1 WO 2019071282 A1 WO2019071282 A1 WO 2019071282A1 AT 2018060231 W AT2018060231 W AT 2018060231W WO 2019071282 A1 WO2019071282 A1 WO 2019071282A1
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WO
WIPO (PCT)
Prior art keywords
mixing
liquid
fine
grain mixture
mixture
Prior art date
Application number
PCT/AT2018/060231
Other languages
German (de)
English (en)
Inventor
Franz GÖTSCHL
Lutz Sparowitz
Original Assignee
Goetschl Franz
Lutz Sparowitz
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Filing date
Publication date
Application filed by Goetschl Franz, Lutz Sparowitz filed Critical Goetschl Franz
Publication of WO2019071282A1 publication Critical patent/WO2019071282A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/40—Mixing specially adapted for preparing mixtures containing fibres
    • B28C5/402—Methods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
    • B28C7/16—Discharge means, e.g. with intermediate storage of fresh concrete
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B01F23/53—Mixing liquids with solids using driven stirrers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/50—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle
    • B01F25/54—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle provided with a pump inside the receptacle to recirculate the material within the receptacle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
    • B01F27/1125—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades with vanes or blades extending parallel or oblique to the stirrer axis
    • B01F27/11251—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades with vanes or blades extending parallel or oblique to the stirrer axis having holes in the surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/84—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with two or more stirrers rotating at different speeds or in opposite directions about the same axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/86—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis co-operating with deflectors or baffles fixed to the receptacle
    • B01F27/861—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis co-operating with deflectors or baffles fixed to the receptacle the baffles being of cylindrical shape, e.g. a mixing chamber surrounding the stirrer, the baffle being displaced axially to form an interior mixing chamber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F31/00—Mixers with shaking, oscillating, or vibrating mechanisms
    • B01F31/80—Mixing by means of high-frequency vibrations above one kHz, e.g. ultrasonic vibrations
    • B01F31/83—Mixing by means of high-frequency vibrations above one kHz, e.g. ultrasonic vibrations comprising a supplementary stirring element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F31/00—Mixers with shaking, oscillating, or vibrating mechanisms
    • B01F31/80—Mixing by means of high-frequency vibrations above one kHz, e.g. ultrasonic vibrations
    • B01F31/85—Mixing by means of high-frequency vibrations above one kHz, e.g. ultrasonic vibrations with a vibrating element inside the receptacle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/181—Preventing generation of dust or dirt; Sieves; Filters
    • B01F35/187—Preventing generation of dust or dirt; Sieves; Filters using filters in mixers, e.g. during venting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/45—Closures or doors specially adapted for mixing receptacles; Operating mechanisms therefor
    • B01F35/451—Closures or doors specially adapted for mixing receptacles; Operating mechanisms therefor by rotating them about an axis parallel to the plane of the opening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/712—Feed mechanisms for feeding fluids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/71745—Feed mechanisms characterised by the means for feeding the components to the mixer using pneumatic pressure, overpressure, gas or air pressure in a closed receptacle or circuit system
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/71775—Feed mechanisms characterised by the means for feeding the components to the mixer using helical screws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/75—Discharge mechanisms
    • B01F35/754—Discharge mechanisms characterised by the means for discharging the components from the mixer
    • B01F35/7547—Discharge mechanisms characterised by the means for discharging the components from the mixer using valves, gates, orifices or openings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
    • B28C5/10—Mixing in containers not actuated to effect the mixing
    • B28C5/12—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers
    • B28C5/16—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers the stirrers having motion about a vertical or steeply inclined axis
    • B28C5/166—Pan-type mixers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/48—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions wherein the mixing is effected by vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
    • B28C7/04—Supplying or proportioning the ingredients
    • B28C7/06—Supplying the solid ingredients, e.g. by means of endless conveyors or jigging conveyors
    • B28C7/062—Supplying the solid ingredients, e.g. by means of endless conveyors or jigging conveyors with a pneumatic or hydraulic conveyor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
    • B28C7/04—Supplying or proportioning the ingredients
    • B28C7/12—Supplying or proportioning liquid ingredients

Definitions

  • the invention relates to a mixing device for producing a fiber concrete, comprising:
  • a mixing tool for mixing the fine grain mixture with the liquid and for mixing the coarse grain mixture with the suspension.
  • the invention relates to a method for producing a fiber concrete, comprising the steps:
  • CH 428536 A discloses a different mixing container for producing binder mixtures.
  • construction site concrete is also processed, which is produced directly on the construction site.
  • the construction site concrete can be used if the access routes from the stationary concrete plant are too long. Construction site concrete is also sometimes used on major construction sites.
  • UHPC can self-compacting and flowable manufactured ⁇ to. This allows UPHC to be poured into very tight shapes.
  • UHPC has a very high mechanical both resistance ⁇ ability, in particular in terms of pressure resistance, Verbundfes ⁇ ACTION and abrasion resistance.
  • UHPC is particularly resistant to chemical agents such as chloride (in the form of road salt, seawater, etc.).
  • the coarse grain bulk mixture and the fine grain bulk mixture can be transported in a separate state.
  • the coarse grain bulk mixture has a larger average grain size than the fine grain bulk mixture.
  • the advantage of this embodiment is, in particular, that higher demands are placed on the degree of drying of the fine grain bulk material mixture.
  • the fine-grain bulk material mixture comprises the binder which is used in the processing of the dry components. le with the addition of liquid ingredients, in particular water, sets the concrete building material and developed the required strength.
  • the coarse-grained bulk material mixture may have a lower degree of dryness than the fine-grained bulk material mixture.
  • the coarse-grained bulk material mixture can be free of binders, in particular free of cement. As a result, therefore, the cost of drying the starting materials of the concrete building material can be substantially reduced.
  • the coarse-grain bulk material mixture and the fine-grain bulk material mixture can be processed just prior to the intended use of the concrete building materials by the liquid Be ⁇ constituents, particularly water, are added.
  • the fine grain bulk material mixture is placed in a mixer, which has been previously filled with the water or with the liquid mixture.
  • the mixer has at least one mixing device in order to keep the water or the liquid mixture in motion during the intake of the fine-grain bulk mixture.
  • the fine grain bulk material mixture is sprinkled in the mixer from above onto the upper side of the water or of the liquid mixture. Accordingly , the delivery of the coarse-grain bulk material mixture takes place on the surface of the suspension.
  • the Fa ⁇ serbeton having a relatively high air content when using the known mixer, which has a negative effect on the quality of the fiber concrete.
  • the object of the present invention is to alleviate or remedy the disadvantages of the prior art.
  • the invention is therefore particularly aimed at specifying a mixing apparatus and a method with which venting of the fiber concrete during the mixing process is improved.
  • a guide for forming at least a circulation flow of the liquid in the mixing chamber wherein the guide means a Wurgeleitelement for a sideways portion of the circulating flow for sprinkling the fine grain or coarse grain mixture and an upward guide telement for an upward section of the Umströmstrstr ⁇ tion for directing the circulation flow in the direction of the Seiteauxleitelements, wherein
  • the mixing tool has at least one swirling element within ⁇ half of the upflow, wherein the Verwirbe ⁇ ment element is rotatable about a substantially vertical axis of rotation in the operating state.
  • the solids (ie, the fine grain or coarse grain particles) in the circulation flow through the rotating in hori zontal plane rotating vortex element exposed to a centrifugal force, which conveys the solids out to the wall of the Aufnchleitelements out, whereas the air is concentrated in the te with te.
  • the air can escape upward in the Be ⁇ rich above the liquid surface. So who the air pockets significantly reduced, whereby the quali ity of the fiber concrete is significantly improved.
  • the production of the fiber concrete preferably has at least the following three successive phases:
  • the liquid is introduced into the mixing chamber.
  • water with at least one further liquid additive in particular with a liquid flow agent and / or with a nanosilica and / or with a binding accelerator and / or with a setting retarder, is preferably processed together to form a liquid mixture.
  • the fine grain mixture is delivered to the surface of the circulating liquid, whereby the fine grain mixture is dispersed into a suspension.
  • the coarse grain mixture is delivered to the surface of the circulating suspension.
  • the mixing tool has at least one rotatable in one direction of swirling element and at least one rotatable in the other direction of rotation ⁇ swirling element.
  • the main planes are preferably offset from one another by substantially 90 degrees with respect to the axis of rotation.
  • two are preferred rotatably connected, in the other direction ro ⁇ tierbare (ie oppositely rotating) before ⁇ seen whose main planes are also preferably offset by one essential ⁇ 90 degrees to each other with respect to the axis of rotation
  • the turbulators are in the vertical Rich ⁇ tion sequentially, ie one above the other, arranged.
  • the Ver ⁇ wirbelungselement preferably has at least one passage opening for the liquid or suspension.
  • meh ⁇ eral passage openings per swirler are provided.
  • the swirler is connected to a vertical in the operating state in Wesentli ⁇ chen shaft which passes through the Aufiertele ⁇ ment.
  • the vertical shaft extends beyond the upper end of the Aufiertelements addition, according to above, wherein the vertical shaft is, in particular, connected above the Aufierlei ⁇ wick member with a drive, for example an electric motor.
  • the turbulence element preferably extends over substantially the entire inner diameter of the upflow element.
  • the total width i. the Clearre- ckung in the horizontal direction
  • the Verwirbelungselements substantially the inner diameter of the upflow.
  • the swirling element protrudes to the inner wall of the upflow.
  • the upward guide element preferably has a continuous from the lower end to the upper end interior.
  • the upflow is designed as a tube.
  • the mixing tool has at least one stirring element which can be rotated along the surface of the side-guide element.
  • the Stirring element thus moves along the surface of the Seit ⁇ downward element, to which the sideways portion of the circulatory ⁇ onsströmung is acted upon by the fine grain or coarse grain mixture.
  • a passage is formed between the free edge region of the side guide and the wall of the housing, through which the liquid (or the suspension in a later phase of the mixing process) from the top of the side-guiding element downward in the direction of the lower portion Upward conductive element can pass to form the Zirkulationsströ ⁇ tion within the mixing chamber.
  • the Seityleitelement is preferably arranged at the upper end of the Auf formatleitelements, wherein said is substantially rotationally symmetrical with respect to out ⁇ forms Since ⁇ .leitelement preferably a central axis of Auf formatleitelements.
  • a circulation flow maintaining pump is preferably provided, which is preferably arranged at the lower end of the upflow.
  • the pump is received within the upflow.
  • the feed and bedding device in a particularly preferred embodiment has a fluidized-bed module for fluidizing the fine-grain mixture and / or the coarse-grain mixture before sprinkling in the mixing chamber.
  • the fluidized-bed module is connected to a supply for under-air, that is to say a stream of air flowing from below into the fluidized-bed module. Due to the under-air, the particles of the fine-grain or coarse-grain mixture are placed in a fluidized (ie floating) state before these particles are introduced into the mixing chamber.
  • the fluidized bed module is connected to a fan for a (in particular substantially horizontal) conveying air flow in order to convey the fine grain or coarse grain mixture from the fluidized bed module in the direction of the mixing chamber.
  • the feed and litter device preferably has a first feed for the fine-grain mixture, in particular a first screw conveyor, and a second feed for the coarse-grain mixture, in particular one second screw conveyor on.
  • an ultrasound module for irradiating the surface of the liquid when sprinkling the fine-grained bulk material mixture and / or for irradiating the surface of the suspension when sprinkling the coarse-grain bulk mixture is provided with an ultrasound.
  • the coarse-grain mixture having a proportion of more than 60 percent by mass, preferably of more than 75 mass percent, more preferably greater than 90 Mas ⁇ senprozent, in particular more than 99 mass percent, an aggregate having particle sizes of more than substantially 0, 04 mm, preferably of more than substantially 0.05 mm, more preferably of more than substantially 0.06 mm, on.
  • the coarse grain mixture consists of more than 60 percent by mass, but preferably to a much higher proportion, of an aggregate whose grain sizes are consistently greater than substantially 0.06 mm, in particular greater than 0.125 mm.
  • the coarse grain mixture can, however, comparatively small amounts of Have ingredients that have a particle size below the limits mentioned.
  • a grain size of ⁇ quiva ⁇ lent micr ie the corresponding diameter of a perfect sphere understood.
  • the equivalent diameter is determined in particular as a screen diameter.
  • the grain sizes of the aggregates of the coarse grain mix are smaller than substantially 10 mm, particularly preferably less than 9 mm, in particular smaller than in Wesent ⁇ union 8 mm.
  • the coarse grain mixture (coarse grain / bulk material mixture) preferably contains fibers, in particular steel fibers.
  • the fine-grain mixture having a proportion of more than 60 percent by mass, preferably of more than 75 mass percent, more preferably greater than 90 percent by mass, in particular of more than 99 percent by mass of a fine grain mixture with a grain size of less than Wesent ⁇ union 0 , 2 mm, preferably less than substantially 0.15 mm, in particular less than substantially 0.125 mm, on.
  • the fine-grain mixture fine-grained bulk material mixture
  • the fine-grained mixture may have comparatively small proportions of constituents which have a grain size above the stated limit values.
  • the fine-grain mixture preferably comprises a rock flour.
  • the fine-grain mixture preferably has a binder.
  • the fine-grain mixture contains a flow agent in the dry state and / or a retarder in the dry state and / or a defoamer in the dry state.
  • Fig. 1 shows a mixing device according to the invention for the manufacture ⁇ development of fiber concrete.
  • FIG. 2 shows a cross section of the mixing device according to FIG. 1.
  • FIG. 3 shows a cross section through an upflow element of the mixing device according to FIGS. 1, 2.
  • FIGS. 4 and Fig. 5 respectively show the mixing apparatus during the pouring of the solid components of the fiber concrete on the upper surface of the ⁇ circulation flow.
  • Fig. 6 shows schematically the beginning of a first phase of the mixing process, wherein the liquid additions are introduced into the mixing chamber.
  • Fig. 7 shows schematically the end of the first phase of the Mischpro ⁇ zesses, wherein a circulation flow ⁇ has set within the mixing chamber.
  • FIG. 8 shows schematically an agglomerate of the solids feed which is to be broken up during operation of the mixing device.
  • FIG. 9 shows schematically the flow conditions at the end of a second phase of the mixing process, in which the Feinkornparti ⁇ angle are scattered on the surface of the liquid, whereby a suspension of the fine grain particles and the liquid is formed.
  • Fig. 10 shows schematically the flow conditions at the end of egg ⁇ ner third phase of the mixing process, the coarse grain particles are scattered on the surface of the suspension.
  • Fig. 11 shows schematically the emptying of the mixing device as a final step of the mixing process.
  • FIGS. 1 to 5 schematically show the components of a mixing device for producing a fiber concrete which are essential for the invention.
  • the mixing device 1 for the production of fiber concrete in particular ultra high performance fiber reinforced concrete (UHPC)
  • a housing 2 which in the upper region substantially is cylindrical and the lower portion toward the bottom funnel-shaped, in particular substantially conical, converges.
  • the mixing chamber 3 in the interior of the housing 2 is ei ⁇ ne mixing chamber 3 are ⁇ forms of the starting substances of the fiber concrete.
  • the mixing chamber 3 is drawn schematically with a in Fig. 6
  • Liquid supply 4 connected, with which the liquid additions (hereinafter "liquid”) for the Fa ⁇ serbeton in the mixing chamber 3 can be passed.
  • the introduction of the liquid additions, in particular water and eluents, into the mixing chamber 3 is illustrated in FIG. 6 by dotted lines 4a.
  • a supply and Einstreuein ⁇ device 5 is provided, with which on the one hand supplied to a fine-grain mixture in the mixing chamber 3 and discharged onto the surface of the liquid and fed on the other hand a Grobkornmi ⁇ research and onto the surface of a previously from the Fine grain mixture and the liquid formed suspension is discharged.
  • a mixing tool 6 is arranged in the mixing chamber 3, with which first the fine grain grain mixture with the liquid and then the coarse grain mixture can be mixed with the suspension.
  • a flow-guiding device 7 for forming at least one circulation flow S1 of the liquid is arranged in the mixing chamber 3 (see FIGS. 7, 9).
  • the Strömungsleit Vietnamese 7 has a Seit arrangementleitelement 8 for a sideways portion (ie, a more horizontal in the vertical direction than extending portion) of the circulation flow Sl, in which, depending on the phase of the mixing process, the fine grain or coarse grain mixture is interspersed.
  • the flow guiding device 7 has an upflow element 9 for an upward section (ie a section extending more vertically than in the horizontal direction) of the circulation flow S1. In the embodiment shown, the upward guide element 9 extends substantially in the vertical direction.
  • the Auf organizationleitelement 9 may be out of a tube forms ⁇ .
  • the upflow 9 leads - depending on the progress ⁇ step of the mixing process - the liquid or the suspension of a bottom portion 3 a of the mixing chamber 3 to the Seitrichleitelement 8, which is arranged in the upper region of the mixing chamber 3.
  • the Seitrichleitelement 8 is arranged at obe ⁇ ren end of the Auf structureleitelements 9.
  • the Seitrichleitelement 8 is also manufactured ⁇ det as a screen, which extends substantially rotationally symmetrical with respect to the central vertical axis 9a of the tubular Aufierleitele ⁇ element 9.
  • all location and directional indications such as “top,” “bottom,” “top,” “bottom,” “horizontal,” “vertical,” etc., refer to the intended operating condition of the mixing apparatus 1 when mixing the fiber concrete.
  • the mixing tool 6 has a plurality of turbulence elements 10a, 10b within the upflow element 9.
  • the swirling elements 10a, 10b are each mounted rotatably about a pivotable in the operating state substantially verti ⁇ le axis of rotation.
  • the mixing tool 6 two in one direction of rotation on rotier ⁇ bare turbulators 10a and two rotatable in the other rotational Rich ⁇ tung turbulators 10b.
  • Each Verwirbe- element 10a, 10b in this case has a plurality of passage openings 11 for the circulation flow Sl.
  • the turbulence elements 10a, 10b extend substantially over the entire inner diameter of the Auf websiteleitelements 9. Due to the Ver ⁇ wirbelungs institute 10a, 10b has a substantially horizonta ⁇ le circuit flow component along the upward portion of the circulation flow Sl is formed.
  • the swirling elements 10a rotating in one direction are connected in a rotationally fixed manner to a first shaft 15a, which is connected to a first drive 16a (see Fig. 4, not shown in Fig. 1 for the sake of clarity).
  • the swirling elements 10b rotating in the other direction are non-rotatably connected to a second shaft 15b, which is connected to a second drive 16b.
  • the stirring element 13 is connected to a third shaft 15c, which is connected to a third drive 16c.
  • the pump 14 is rotatably connected to a fourth shaft 15d, which is connected to a fourth drive 16d.
  • the first 16a, second 16b, third 16c and fourth drive 16d are independent voneinan ⁇ , so that the speeds of the first 15a, second 15b, third 15c and fourth shaft 15d can be set individually.
  • the first 15a, second 15b, third 15c and fourth shaft 15d are arranged one inside the other, where ⁇ in the first 15a, second 15b, third 15c and fourth shaft 15d respectively pass through the upward guide element 9 in the direction of its longitudinal axis 9a.
  • a first feed 17a for the fine grain mixture in the dry state here in the form of a first screw conveyor
  • a separate second feed 17b for the coarse grain mixture in the dry state here in the form of a second screw conveyor, up.
  • the fine-grain and coarse-grain mixtures are fed to a fluidized-bed module 18 in successive phases of the mixing process along the flow direction S2 (see Fig. 5) in order to fluidize the fine-grain mixture or coarse-grain mixture prior to littering.
  • the fluidized bed module 18 has at the bottom a supply 19 for a Unter Kunststoffströ ⁇ tion S3.
  • the components of the fine grain or coarse grain mixture are fluidized.
  • a fan 20 for a ho ⁇ zontal conveying air flow S4 is connected, so that the fine grain or coarse grain mixture is transported in the fluidized state in a supply line 21.
  • the supply line 21 opens into a downwardly open, for example, circular ⁇ shaped in cross-section bedding element 23 with a litter chamber 23a, through which the fine-grain and coarse-grain mixture in the direction of Since then discharged encouragetelements 8 of the flow guide 7 (see FIG. Arrow S5 in Fig 5).
  • a valve 22 is provided which can be transferred between an open position for introducing the fine grain or coarse grain mixture into the litter chamber 23a and a closed position for closing the litter chamber 23a.
  • a Fil ⁇ tergewebe 24 In the radial direction outside of the bedding element 23 extends at least a Fil ⁇ tergewebe 24.
  • the region above the filter cloth 24 is connected to a dust filter 25, which cleans the flow of the exhaust S6 transported exhaust air prior to discharge into the environment.
  • FIG. 4 schematically shows a filter cleaning vibrator 24a.
  • a plurality of ultrasonic modules 26 are shown schematically further comprising a ⁇ are directed to emit ultrasound in the direction of Seiteauxleitelements 8 and the rotatable stirring member. 13
  • the surface of the liquid when sprinkling the fine-grained bulk material mixture or the surface of the suspension when sprinkling the coarse-grained bulk mixture be subjected to ultrasound.
  • FIGS. 6, 7, 9, 10, 11 the individual phases of the mixing process are shown schematically.
  • Fig. 6 the filling of the mixing device 1 by addition of liquid components of Faserbetons over a plurality of liquid outlets 27a, 27b, 27c of the liquid supply 4 in the mixing chamber 3 can be seen (first phase).
  • the copesstechniksausläs ⁇ se 27a, 27b, 27c are formed in the embodiment shown by injectors 27a in the upper region of the litter 23, injectors 27b along the entire flow guide 7 and injectors 27c directly below the filter fabric 24 ge ⁇ .
  • the pressure generated by the liquid inlets 27a, 27b, 27c the interior of the mixing device 1 is cleaned of residues after each mixing operation and at the same time the mixing chamber 3 is filled.
  • Fig. 7 shows schematically the formed in the mixing chamber 3 circulating flow Sl of the liquid after completion of the addition of the liquid components of the fiber concrete on the liquid keitseinlässe 27a, 27b, 27c of the liquid supply 4.
  • the flues ⁇ stechnik is connected to the pump 14 through the Aufnchleitelements 9 pumped upwards and then over the Seiteauxleitelement 8 to the side (ie radially outward) out.
  • a passage 8a is formed, through which the liquid can pass down.
  • the liquid flows along the inner wall of the housing 2 to the bottom portion 3a of the mixing chamber 3. From there the liquid passes in turn in the Aufnchleitelement 9, so that the ge ⁇ desired circulation flow Sl is obtained in the mixing chamber.
  • Fig. 9 shows the time subsequent to the first phase two ⁇ te phase in which the fine-grain bulk material is deposited mixture over the litter means 5 successively to the circulating liquid surface of the mixing process.
  • ⁇ for the grain flour fine-grain bulk material mixture
  • air flow sub-S3 that is in a floating supply was added and blown by the horizontal air flow into the perception ⁇ re of the bedding element 23, in the litter chamber 23a. There, the flow rate is greatly reduced and the fine-grained bulk material mixture settles evenly on the surface of the liquid.
  • agglomerates are formed. These are simplified in Fig. 8 Darge ⁇ represents. Similar solid particles 31 tend due to their high affinity for lump formation and include in the spaces 34 formed gas, in particular air, a. In addition, the cohesion between the particulates is enhanced by adhesion forces 32 occurring. The surface tension of the liquid forms a shell 33 around the agglomerate, through which the gas inclusions in the intermediate spaces 34 can no longer escape. This gas retention falsify the result mixture and can be substantially reduced by the process shown in Fig. 8 A ⁇ scatter the Feinstoffteilchen. The fine grains may preferably be scattered in the singulated state on the surface of the liquid. The irradiation with ultrasound can further contribute to the surface tension around the agglomerates and the surface of the suspension profundbre ⁇ Chen, so that the isolated fine grains can easily immerse in the resulting suspension.
  • the agglomerates are aufschlössen using the mixing tools kol ⁇ loidal.
  • the mix is pumped upwards by the vertical upflow element 9 ("whirl pipe") and arrives successively in the area of action of the rapidly rotating second 10b and first swirling elements 10a
  • the paddles 10b rotate counterclockwise
  • the agitator 13 rotates counterclockwise first mixing phase (see Fig.. 6, 7) all rotate mixing tools relatively quickly.
  • the two ⁇ th mixed phase (see. Fig. 9) 14 rotates the pump slowly.
  • the paddles 10a, 10b continue to rotate very fast, whereas to the stirring element now turns comparatively slowly.
  • the mix is taken from the rotating, ie rotate about the vertical axis 9a the mixing tools each in their direction of rotation.
  • the hole-like openings 11 in the paddles 10a, 10b cause with their sharp edges turbulent flows in the mix and locally also cavitation phenomena. Where di mixing tools rotate against each other, as well as high shear forces and thus to arise also turbulence in the mixing ⁇ good. These turbulence and cavitation phenomena cause the colloidal digestion of agglomerates in the mix.
  • the rotating paddles 10a, 10b strip the mix from the inner wall of the upflow 9 and thus prevent the mix adheres to the pipe wall.
  • Fig. 10 shows schematically the third phase of the mixing process which is timed to the second phase, i. the introduction and distribution of the fine-grain mixture (see Fig. 9), followed.
  • the third phase the coarse grain mixture is applied via the bedding device 5 to the suspension of the fine grain mixture and the liquid. Therefore, the level has increased in the third phase compared to the second phase.
  • the swirling elements 10a, 10b are slower in the third phase than in the second phase.
  • the stirring element 13 rotates in the third phase, preferably the same speed as in the second phase.
  • the pump 14 can rotate relatively quickly.
  • the fourth phase of the mixing process (post-mixing) is initiated. After the coarse grain bulk mixture was sprinkled, the last engaged ⁇ brought coarse grain needs to be mixed. All mixing tools work at the same rotational speed as in the third phase.
  • the mixing device 1 also has a closing element 28 with which a bottom opening 29 of the mixing chamber 3 can be released after completion of the mixing process according to the first to fourth phases.
  • a flap is provided as closing element 28, which is connected to a drive unit 30, here a hydraulic cylinder.
  • the bottom opening 29 is opened by releasing the closing element 28 in order to allow a flow of Faserbe ⁇ tons in a collecting container, such as a crane bucket to allow (see arrow S7 in Fig. 11).
  • the pump 14 and the swirling elements 10a, 10b rotate during emptying in the same direction of rotation, for example, counterclockwise, whereby the emptying of the mixing chamber 3 is supported. Furthermore, residues on the Seitierleitelements 8 can be removed by the stirring element 13.
  • Fig. 12 exemplifies the production of a

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)

Abstract

L'invention concerne un dispositif de mélange (1) et un procédé de fabrication d'un béton à adjuvant fibreux. Le dispositif comprend : - un boîtier (2) pourvu d'une chambre de mélange (3), - une amenée en liquide (4) destinée à amener un liquide dans la chambre de mélange (3), - un dispositif d'amenée et de distribution (5) destiné à amener un mélange à grains fins, à distribuer le mélange à grains fins sur la surface du liquide et à amener un mélange à grains grossiers et à distribuer le mélange à grains grossiers dans une suspension constituée du mélange à grains fins et du liquide, - un outil de mélange (6) destiné à mélanger le mélange à grains fins au liquide et à mélanger le mélange à grains grossiers à la suspension, - un dispositif de guidage d'écoulement (7) destiné à former au moins un écoulement de circulation (S1) du liquide dans la chambre de mélange (3). Le dispositif de guidage d'écoulement (7) comporte un élément de guidage latéral (8) destinée à une partie latérale de l'écoulement de circulation (S) pour distribuer le mélange à grains fins et à grains grossiers et un élément de guidage montant (9) destiné à une partie montant de l'écoulement de circulation pour guider l'écoulement de circulation (S1) en direction de l'élément de guidage latéral (8). L'outil de mélange (6) comporte au moins un élément de tourbillonnement (10a, 10b) à l'intérieur de l'élément de guidage montant (9). L'élément de tourbillonnement (10a, 10b) peut tourner sur un axe de rotation (9a) sensiblement vertical à l'état de fonctionnement.
PCT/AT2018/060231 2017-10-03 2018-10-03 Dispositif de mélange et procédé de fabrication d'un béton à adjuvant fibreux WO2019071282A1 (fr)

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ATA50844/2017A AT520505A1 (de) 2017-10-03 2017-10-03 Mischvorrichtung
ATA50844/2017 2017-10-03

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Cited By (6)

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Publication number Priority date Publication date Assignee Title
CN112895148A (zh) * 2021-02-07 2021-06-04 恒元建设控股集团有限公司 一种纤维混凝土搅拌装置
CN112959499A (zh) * 2021-03-11 2021-06-15 中海外交通建设有限公司 一种道路桥梁用水泥基裂缝注浆料的制备方法
CN113209924A (zh) * 2021-04-30 2021-08-06 石峰 一种单螺旋式碳钢反应釜
CN113828238A (zh) * 2021-11-26 2021-12-24 潍坊市宇虹防水材料(集团)有限公司 一种隔热防水涂料制备方法
CN113878717A (zh) * 2021-10-12 2022-01-04 临沂职业学院 一种建筑施工用混凝土搅拌机
CN114789010A (zh) * 2022-06-23 2022-07-26 诸城泰盛化工股份有限公司 一种组合式原料翻拌装置

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GB2079615A (en) * 1980-07-12 1982-01-27 Hedrich Vakuumanlagen Wilhelm Apparatus for the mixing and degasifying of compomemts of synthetic resins
JPS57127431A (en) * 1981-01-29 1982-08-07 Nitsukuu Kogyo Kk Vacuum mixing and defoaming machine
SU1756337A1 (ru) * 1990-01-11 1992-08-23 Технологическо-Конструкторский Институт Научно-Производственного Объединения "Яловены" Установка дл приготовлени суспензий
WO2009092207A1 (fr) * 2008-01-22 2009-07-30 Inano Limited Agitateur, dispositif doté de cet agitateur pour produire de la poudre nanométrique et procédé associé
EP3208061A1 (fr) * 2016-02-15 2017-08-23 Götschl, Franz Procédé de fabrication d'un matériau à base de béton

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Publication number Priority date Publication date Assignee Title
US1560826A (en) * 1924-04-24 1925-11-10 Kirschbraun Lester Apparatus for making bituminous emulsion
CH428536A (de) * 1965-03-11 1967-01-15 Kalich Rudolf Verfahren und Vorrichtung zum Herstellen von Bindemittelgemischen, und Anwendung des Verfahrens
GB2079615A (en) * 1980-07-12 1982-01-27 Hedrich Vakuumanlagen Wilhelm Apparatus for the mixing and degasifying of compomemts of synthetic resins
JPS57127431A (en) * 1981-01-29 1982-08-07 Nitsukuu Kogyo Kk Vacuum mixing and defoaming machine
SU1756337A1 (ru) * 1990-01-11 1992-08-23 Технологическо-Конструкторский Институт Научно-Производственного Объединения "Яловены" Установка дл приготовлени суспензий
WO2009092207A1 (fr) * 2008-01-22 2009-07-30 Inano Limited Agitateur, dispositif doté de cet agitateur pour produire de la poudre nanométrique et procédé associé
EP3208061A1 (fr) * 2016-02-15 2017-08-23 Götschl, Franz Procédé de fabrication d'un matériau à base de béton

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112895148A (zh) * 2021-02-07 2021-06-04 恒元建设控股集团有限公司 一种纤维混凝土搅拌装置
CN112959499A (zh) * 2021-03-11 2021-06-15 中海外交通建设有限公司 一种道路桥梁用水泥基裂缝注浆料的制备方法
CN112959499B (zh) * 2021-03-11 2022-03-25 中海外交通建设有限公司 一种道路桥梁用水泥基裂缝注浆料的制备装置及方法
CN113209924A (zh) * 2021-04-30 2021-08-06 石峰 一种单螺旋式碳钢反应釜
CN113878717A (zh) * 2021-10-12 2022-01-04 临沂职业学院 一种建筑施工用混凝土搅拌机
CN113828238A (zh) * 2021-11-26 2021-12-24 潍坊市宇虹防水材料(集团)有限公司 一种隔热防水涂料制备方法
CN114789010A (zh) * 2022-06-23 2022-07-26 诸城泰盛化工股份有限公司 一种组合式原料翻拌装置

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